#define  _CRT_SECURE_NO_WARNINGS
class Solution {
public:
    vector<int> productExceptSelf(vector<int>& nums) {
        int n = nums.size();
        vector<int> left(n, 1), right(n, 1), ret(n);
        for (int i = 1; i < n; i++)left[i] = left[i - 1] * nums[i - 1];
        for (int i = n - 2; i >= 0; i--)right[i] = right[i + 1] * nums[i + 1];
        for (int i = 0; i < n; i++)ret[i] = left[i] * right[i];
        return ret;
    }
};